Image forming apparatus
US4939548A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 29, 1989 |
| Grant date | Jul 3, 1990 |
| Priority date | — |
| Expiry date | Mar 29, 2009 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03G2215/018
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
In an image forming apparatus, a support member attachably and detachably supporting a plurality of developing units is provided for moving the developing units upwardly and downwardly or along a common circular orbit by vertical or rotative movement. A vertical movement support member balances with balancers, while a rotary support member has rotative balance by mutual position of each developing unit. A lock member for locking a support member at a desired position and a sensor for detecting the movement of the support member when unlocked are actuated for judging an unbalanced state of the support member by a detecting signal of the sensor.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.